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UNTTED STATES PATENT @FFME- HENRY A. OHASE, OE BOSTON, MASSACHUSETTS,ASSIGNOR To ALBERT wATTs, OE SAME PLACE.

COMBINED TELEPHONIO AND SIGNAL'ING SYSTEM.

SPECIFICATION forming part of Letters Patent No. 528,075, dated October23, 1894. Application tiled June 25, 1894.l Serial No. 515,588. (Nomodel.)

To all whom t mrty'corwen:

Be it known that I, HENRY A. CHASE, residing in Boston, in the county ofSuffolk and- State of Massachusetts, have invented an Improvement in aCombined Telephonie and Signaling System, of which the followingdescription, in connection with the accompanying drawings, is aspecification, like letters on the drawings representing like parts.

f This invention relates to a combination telephone and signalingsystem, and has for its object to provide an efcient and less expensivesystem, in which the use of extra batteries for the telephone and groundtaps or connections through condensers, such as now commonly employed insignaling systems employing the telephone as an auxiliary, may bedispensed with, thereby avoiding disturbances from earth currents andobtaining a superior telephonic service in connection with a signalingsystem. This result is achieved by the employment of a telephonetransmitter of that class known as the carbon transmitter, which, inaccordance with this invention, is connected in a branch or shuntcircuit around the signal transmitting apparatus, and by means of acircuit controller in the main line, which, when opened, brings theshunt circuit into effective operation,'to place the telephonieapparatus in speaking connection with a telephonie apparatus at adistant point or station. The circuit controller governing the main linemay and preferably will be employed as a support for the telephonereceiver. In the present instance, I have represented the telephonieapparatus as used in conjunction with a signaling system comprising a`substation and a main station, the substation being represented asprovided with a signal transmitting apparatus comprising two breakwheels, one to indicate the number of the box or substation and theother to indicate the telephone signal for said box or substation, themain station comprising a relay and a local circuit controlled by saidrelay and including a register magnet and a bell magnet. The signalingsystem may be employed for any desired or required purpose, such forinstance, as fire, police, messenger service, &c., and to facilitatedescription, I will hereinafter refer to the signaling system as apolice signaling system.

Figure l is a diagram of circuits representing a combinedtelephone andsignaling system embodying this invention, thesystem being shown incondition for communication by telephone, and Fig. 2, a like diagram ofcircuits showing the combined system in its normalcondition, that is,with the telephone `more snbstations located at distant points and whichare `usually signal boxes. In the `present instance, the signalingtransmitting apparatus A is shown as comprising two break wheels aafmounted upon a suitable shaft a2, which in practice, is driven byclock work or othersuitable motor mechanism, such as now commonlyemployed in police and lire alarm signal .boxes and not herein shown..In the present instance, the break wheela is provided with teeth t3-ofsuitable number to indicate the box number 36, while the break wheel osis provided with like teeth 01.3 to indicate the box number, and with anadditional tooth 0,4 forming two substantially long breaks to indicatea` telephone signal. The break Wheels a and a as herein represented haveco-operating with them two contact springs a5 a6 connected by wires a7as to terminals a am, with which co-operates a switch or lever (1,12included in the main line circuit wire (L13. The shaft a2 hascooperating with it the contactlspring 0,14 also included in the mainline wire als. The main `line Wire als, which may be supposed to `be thepositive wire, is connected to the positive pole of the battery B,whichin `practice is located in the main station A', andthe negative poleofthe said battery has connected to it` the other main line wire aw.

In accordance with this invention, the main line wire als has includedin it at the signal transmitting apparatus, a circuit controller B',herein shown as a hooked lever b, vwhich may be supposed to be thewell-known hooked lever upon which the telephone receiver b issuspended, the said lever forming one member of the switch B andco-operating with a contact or terminal b2forming the other member ofthesaid switch. The main line a18 at the receiving station A is providedwith a like circuit controller B2 herein shown as comprising a telephonehook if' and a terminal b2, The main line als as herein representedfurther includes at the receiving station a relay b3, governing a localcircuit L, which in the present instance is shown as including theelectro-magnet b4 of a register R, a bell operating magnet b5, and alocal circuit b, one pole of the battery b" being connected by the wire197 to a back stop b3 for the armature b9 ofthe relay h3, and the otherpole of the battery b being connected by wire bm to the said armature.

In accordance withthis invention, the signaling system thus t'ardescribed has co-operating with it at the transmitting and receivingstations, telephonic transmitting and receiving apparatus, which areincluded in the main line circuit under conditions to be hereinafterdescribed, so as to afford speaking communication between the saidsubstation and main station.

The telephonic apparatus at the transmitting station comprises atelephonic receiver or handphone b and a transmitter c, which may andpreferably will be substantially.

such as shown and described in United States Patent No. 250,250, datedNovember 29, 1881, and commonly known as the I'Iunning transmitter.

The transmitter c and the handphone b are included in a branch or shuntcircuit around the signal transmitting apparatus A, one terminal c ofthe transmitter being connected by wire c2 to the main line cl3 on oneside of the transmitting apparatus A, and the other terminal c*c5 of thesaid transmitter being connected by wire c4 to one terminal c5 of thehandphone, the other terminal c( being joined by wire c7 to the mainline cl3 on the other side of the transmitting apparatus A and beyondthe circuit controller B.

The telephonic apparatus at the receiving station comprises atransmitter c and a hand-l phone b, which are included in a shunt aroundthe circuit controller B2, the terminal c of the' transmitter ca beingjoined by wire c2 to the wire cl3 on one side of the switch B2, and theterminal c3 being joined by wire c@ to the terminal of"n of thehandphone, the other terminal c6 of which is connected by wire c7 to themain line als on the other side of the switch or circuit controller B2.

The transmitters c and ca are commonly made of two terminal plates ordiaphragnis with an interposed body ot' comminuted carbon, and whenthese transmitters are included in a line circuit the resistance ot' thelineis materially increased, so that under normal conditions, the linecircuit may be maintained operative for signaling purposes withseems outbeing interfered with by the said resistance, the presence of which forsignaling purposes may be disregarded.

In Fig. 2, the system is represented as in condition fortransmittingabox number from the substation A to the receiving stationA', which box number will be received and recorded upon the register R.If it is desired by the operator at the substation A to hold telephoniccommunication with the operator at the main station A', the circuitcontroller or switch o, at the substation is moved from the terminal aand brought into engagement with the terminal d10, and when in thiscondition, the signaltransmitting apparatus may be operated to transmitthe telephone signal indicated by the break wheel a', which will bereceived at the main station upon the register, and in the presentinstance, also upon the bell, which telephone signal in the presentinstance will comprise the box number and two substantially long dashes,but instead of this particular manner ot identifying the telephonesignals, any other suitable or desired character may be employed.

When the operator at the substation has transmitted the signal indicatedby the break wheel a', he opens the main line 0,13, which, in thepresent instance, may be done by simply removing the handphone bfromitshook b, so as to permit the spring d connected to the said hook towithdraw it from contact with its co-operating terminal b2, and theoperator at the central or main station, upon the receiptof thetelephone signal, also opens the main line at the receiving station, byremoving the handphone b' from its hook b, thereby permitting the springcZto withdraw the said hook from engagement with its terminal bh. Theopening of the main line at the transmitting station as just described,throws the shunt circuit including the telephone transmitter c andreceiver 1? into active or effective condition, that is, into activecircuit relation with the transmitter and receiver ca and ZJ at thecentral station, which are also included directly. in the line by theopening of the switch B2. When the circuit connection thus described, isestablished, communication may be held between the station A andsubstation A and vice versa, and the mainline circuitis at the same timemaintained intact for the reception of any signal from any other box orsubstation connected in the line.

The telephonic circuit may be traced as followsz-from the positive poleof the battery B, by wire als, through the relay b3, thence by the wirecla, handphone bt, wire c4, transmitter ca, wire 02a, main line als,wire c7, handphone b', wire c4, transmitter c, wire c2, to the line a,thence through the movement of the next adjacent box and return wire C05to the negative pole of the battery B..

In some instances, it may be desirable to reduce the resistance in themain line circuit by short circuiting the relay, which may be IOO ITO

IZO

accomplished by means of a circuit controller,

which may be made after the manner of any graphic key, but which alsomay be an ordinary push button. The circuit controller consists of themovable member e and the stationar member or terminal e the member ebeing connected by wire e2 to the main line als on one side of the relayb3, and the terminal e being connected by wire e8 to the` battery B andpreferably to only a portion of the battery. IVhen it is desired to cutout the relay b3, the operator at the central station may press upon themember e of the circuit controller so as to bring itin contact with theterminal e', in which case the circuit connection will be made throughthis manually operated circuit controller instead of through the relayb3.

In ,the combined telephonie and signaling system herein shown, it willbe noticed that the telephonie instruments, both transmitter andreceiver, are included in the main line to form a part thereof whentelephonie communication between stations is desired, and by so doing, avery considerable saving in the cost and maintenance of the combinedsystem is effected, inasmuch as the eXtra batteries now commonlyemployed in telephonic systems and also the ground taps or earthconnections through condensers are dispensed with, so that a superiorservice is obtained, owing to the fact that disturbances from earthcurrents are avoided. v In" the present instance, I have represented thehooked levers b and ba as moved in one direction by the springs d andd', but I do not desire to limit my invention in this respect as thesaid levers may be positively moved by hand to open the main line, andwhile I prefer to make the telephonie supporting levers b and b aspartof the circuit controllers for the main line, I do not desire tolimit myself in this respect, as the said main line may be provided withother forms of circuit controllers, and a separate support for thetelephonie receivers disconnected from the main line may be employed.

1. In a combined telephonie and signaling system, the combination of thefollowing in-Y strumentalities, vizz-a main line circuit provided With asource of electric supply, a signal transmitting apparatus, and with asignal receiving apparatus included in the main line, a normally closedcircuit controller included in the main line at the signal transmittingapparatus, a shunt circuit around the said controller, a second normallyclosed circuit controller in the main line at the signal receivingapparatus, a shunt circuit around the second circuit controller, atelephonie apparatus comprising a transmitter and a receiver in circuitwith each other and included in the shunt circuit at the transmittingstation under control of the circuit controller at 'the transmittingstation, and both transmitter and receiver being supplied with currentfrom the main line source of supply, a second telephonie apparatus inthe shunt circuit at the receiving station under control of the circuitcontroller at the receiving station, for the purpose specified. y

2. In a combined telephonie and signaling system, the combination of thefollowing instrumentalities, vizz-a main line circuit provided with asource of electric supply, a signal transmitting apparatus, and with asignal receiving apparatus included in the main line, a normally closedcircuit controller included in the main line at the signal transmittingapparatus, a shunt circuit around the said controller, a second normallyclosed circuit. controllerin the main line at the signal receivingapparatus, a shunt circuit around the second circuit controller, atelephonie apparatus comprising a transmitter and a receiver in circuitwith each other and included in the shunt circuit at the transmittingstation under control of the circuit controller at the transmittingstation, and both transmitter and receiverbeing supplied with currentfrom the main line source of supply, and a second telephonie apparatusat the receiving station comprising a transmitter and a receiverincircuit with each other and included in the shunt around the circuitcontroller at the receiving station, for the purpose specified.

3. In a combined telephonie and signaling system, the combination of thefollowing instrumentalities, vizz-a main line circuit provided with asource of 'electric supply, a signal transmitting apparatus included inthe said circuit and comprising a break wheel and a co-operating pen,and a relay at the receiving station, a normally closed circuitcontroller included in the main line at the signal transmittingapparatus, a shunt circuit around said controller, and asecond normallyclosed circuit controller in the main line at the signal receivingapparatus, a shunt circuit around the second controller, a telephonictransmitter and receiver in circuit with each other and included in theshunt circuit at the transmitting apparatus, and both transmitter andreceiver being supplied with current from the main linesourceof supply,and a telephonie transmitter and receiver at the receiving station incircuit With each other and included in the shunt circuit at tho saidreceiving station, and both being supplied with current from the mainline source of supply, substantially as described.

In testimony whereof I have signed. my name to this specification in thepresence of two `subscribing Witnesses.

HENRY A. CHASE.

Witnesses:

JAS. H. CHURCHILL, J MURPHY.

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